/* 初始化所有标签的内外边距 */
*{
	margin: 0;
	padding:0;
}
.box{
	width: 200px;
	height: 200px;
	border: 1px solid black;
	font-size: 36px;
	text-align: center;
	/* float: right; */	/* 右浮动 */
	float: left;	/* 左浮动 */
	
}
.box1{
	width:300px;
	height: 300px;
	background-color: aqua;
}
.fu{
	overflow: hidden;
}

/* 3.添加after伪元素 */
/*after:在...之后 */
.clearfix::after{
	content: "";	/* 内容为空 */
	display: block;
	height: 0;
	clear: both;
	visibility: hidden;
	
}
/* 4.添加双伪元素 */
.clearfix::after,.clearfix::before{
	content: "";
	display: table;
}
.clearfix::after{
	clear: both;
}